Logic of Key-assignment

[ThomasA]

Hello,
this topic surely is as old as pocket calculators have more than one function per key.
Here is a list of key-assignments on the Prime I really like (as a mnemonic)

Pi on 3 (my favorite one!)
reciprocal on division key
absolute value on change sign
degree minute seconds on the number representation key a b/c
Notes and „“ on bundled on one key (0)
Char on Vars key

Are there any more? Do other (HP)calculators have similar smart key assignments?
Thomas